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單項(xiàng)選擇題

If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.

A.refrigerant overcharge
B.overfeeding by the expansion valve
C.a restricted suction strainer
D.due to short cycling of the compressor

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單項(xiàng)選擇題

If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump （）.

A.capacity will increase
B.capacity will decrease
C.suction pressure will increase
D.suction pressure will decrease

單項(xiàng)選擇題

On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used is （）.

A.hydraulic
B.electric
C.steam
D.diesel

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